| 31. | Annual growth rings indicate the animal's age.
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| 32. | Dendrochronological examination of the growth rings in the panel's wood suggests that the timber was felled around 1410.
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| 33. | :The only real way I am aware of is to get a core and count the growth rings.
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| 34. | Like the growth rings of trees, they may contain the record of seasonal changes in the martian climate.
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| 35. | "It's the next big growth ring,"
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| 36. | They verified their work by comparing the growth rings with similar ones in modern-day lizard and alligator bones.
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| 37. | Crocodilians can live 35 75 years, and their age can be determined by growth rings in their bones.
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| 38. | Scientists compare the growth rings at the edge of a panel to the known climatological conditions throughout Europe.
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| 39. | Upon the whole, however, as a tree gets larger in diameter the width of the growth rings decreases.
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| 40. | A count of growth rings in the logs produced an average age of 60 years in these trees.
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